Method remove

packages/table-dev-app/src/features.tsx:409–416

()

    }

    private remove() {
        if (this.state.columns.length <= 2) {
            return;
        }
        const columns = this.state.columns.slice();
        columns.pop();
        this.setState({ columns });
    }

    private swap(a: number, b: number) {
        const columns = this.state.columns.slice();